Smallest number m such that the numerator of sigma(m)/m is equal to n, or zero if no such m exists.

A239578

Smallest number m such that the numerator of sigma(m)/m is equal to n, or zero if no such m exists.

Terms

    a(0) =1a(1) =6a(2) =2a(3) =3a(4) =24a(5) =5a(6) =4a(7) =7a(8) =10a(9) =1080a(10) =35640a(11) =11a(12) =9a(13) =13a(14) =8a(15) =33a(16) =297600a(17) =17a(18) =588a(19) =19a(20) =20a(21) =1782a(22) =1907020800a(23) =23a(24) =216a(25) =45a(26) =34a(27) =78

External references